with connection to the internet from Google apps. or Yahoo!Go - I'm not able to use these clients because, during the initialization/installation process, the application inform me that I have no connection to the internet, even I downloaded them from internet.

with connection through wifi - I already read some info about routers etc. but what I don't understand is, that when I buy the BB, it was working without any problems, but after I installed new OS 4.5.0.52, it doesn't work even I downgrade the OS back.

I'd like to get any advice what it is necessary to set up in the system to solve these problems.
Many thanks .
Imro